Home | History | Annotate | Download | only in rendering 
      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #include "config.h"
     22 #include "core/rendering/RenderSlider.h"
     23 
     24 #include "core/dom/shadow/ShadowRoot.h"
     25 #include "core/html/HTMLInputElement.h"
     26 #include "core/html/shadow/ShadowElementNames.h"
     27 #include "core/html/shadow/SliderThumbElement.h"
     28 #include "core/rendering/LayoutRectRecorder.h"
     29 #include "wtf/MathExtras.h"
     30 
     31 using std::min;
     32 
     33 namespace WebCore {
     34 
     35 const int RenderSlider::defaultTrackLength = 129;
     36 
     37 RenderSlider::RenderSlider(HTMLInputElement* element)
     38     : RenderFlexibleBox(element)
     39 {
     40     // We assume RenderSlider works only with <input type=range>.
     41     ASSERT(element->isRangeControl());
     42 }
     43 
     44 RenderSlider::~RenderSlider()
     45 {
     46 }
     47 
     48 int RenderSlider::baselinePosition(FontBaseline, bool /*firstLine*/, LineDirectionMode, LinePositionMode linePositionMode) const
     49 {
     50     ASSERT(linePositionMode == PositionOnContainingLine);
     51     // FIXME: Patch this function for writing-mode.
     52     return height() + marginTop();
     53 }
     54 
     55 void RenderSlider::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
     56 {
     57     maxLogicalWidth = defaultTrackLength * style()->effectiveZoom();
     58     if (!style()->width().isPercent())
     59         minLogicalWidth = maxLogicalWidth;
     60 }
     61 
     62 void RenderSlider::computePreferredLogicalWidths()
     63 {
     64     m_minPreferredLogicalWidth = 0;
     65     m_maxPreferredLogicalWidth = 0;
     66 
     67     if (style()->width().isFixed() && style()->width().value() > 0)
     68         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(style()->width().value());
     69     else
     70         computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
     71 
     72     if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
     73         m_maxPreferredLogicalWidth = max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->minWidth().value()));
     74         m_minPreferredLogicalWidth = max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->minWidth().value()));
     75     }
     76 
     77     if (style()->maxWidth().isFixed()) {
     78         m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->maxWidth().value()));
     79         m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->maxWidth().value()));
     80     }
     81 
     82     LayoutUnit toAdd = borderAndPaddingWidth();
     83     m_minPreferredLogicalWidth += toAdd;
     84     m_maxPreferredLogicalWidth += toAdd;
     85 
     86     clearPreferredLogicalWidthsDirty();
     87 }
     88 
     89 inline SliderThumbElement* RenderSlider::sliderThumbElement() const
     90 {
     91     return toSliderThumbElement(toElement(node())->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderThumb()));
     92 }
     93 
     94 void RenderSlider::layout()
     95 {
     96     LayoutRectRecorder recorder(*this);
     97     // FIXME: Find a way to cascade appearance.
     98     // http://webkit.org/b/62535
     99     RenderBox* thumbBox = sliderThumbElement()->renderBox();
    100     if (thumbBox && thumbBox->isSliderThumb())
    101         static_cast<RenderSliderThumb*>(thumbBox)->updateAppearance(style());
    102 
    103     RenderFlexibleBox::layout();
    104 }
    105 
    106 bool RenderSlider::inDragMode() const
    107 {
    108     return sliderThumbElement()->active();
    109 }
    110 
    111 } // namespace WebCore
    112